I may have used common sense to determine a light year

[K.I.L.E.R]

c = 3e8m/s

If 1s = 3e8 then:
60sec = 1 min
1hr = 60m
1 day = 24hr
1 week = 24 * 7
1 month = 168 * 4 weeks
1 year = 672 * 12

Time in a year = 29030400
Time * c = 8709120000000000

That's a light year.

 

[_xxx_]

http://www.answers.com/topic/light-year

 

[arjan de lumens]

Most months are slightly longer than exactly 4 weeks; the year is 52 weeks, not 48, so you're off by ~8%. You do appear to have the correct order of magnitude, though.

 

[K.I.L.E.R]

YAY! Common sense works.
Even though some of my facts have been wrong I did the logic correct.

I think I should use common sense more often.

 

[KimB]

Most months are slightly longer than exactly 4 weeks; the year is 52 weeks, not 48, so you're off by ~8%. You do appear to have the correct order of magnitude, though.

Well, even better to just use 365.25 days per year (one quarter for the leap year).

 

[arjan de lumens]

I think I should use common sense more often.

I think ~95% of all people should use common sense more often.

 

[Frank]

Well, even better to just use 365.25 days per year (one quarter for the leap year).

365.24 is exact (no leap year on centuries).

 

[KimB]

365.24 is exact (no leap year on centuries).

Well, 365.2422 if you really want to get down to it

 

[Basic]

LOL!
I see a thread by KILER about him using common sense, and think directly that this is a sign, the world is comming to an end. When I open the thread, IE crash hard.

Regarding how many days there are in a year:
What kind of year is used when defining a light year?

Julian: 365.25 days
Includes 4 year rule (leap day).

Gregorian: 365.2425 days
Includes 100 year rule, and 400 year rule.

Tropical: ~365.2422 days
Time from earths north pole tilted toward sun, until next time it happens.

Sidereal: ~365.2564 days
Same as tropical but wrt to other stars than the sun.

 

[nutball]

Well it depends how you define the length of a day...

EDIT: erm... yeah, what Basic said...

Second EDIT: Well fundamentally if you care about the difference when measuring distance then light-years aren't the thing to use, and secondly they're very passe these days, as the parsec is the unit of choice for professional astronomers.

 

[KimB]

Second EDIT: Well fundamentally if you care about the difference when measuring distance then light-years aren't the thing to use, and secondly they're very passe these days, as the parsec is the unit of choice for professional astronomers.

Some astronomers swear by centimeters

 

[KimB]

What kind of year is used when defining a light year?

Well, according to my TI calculator it's the Tropical year. Really don't know if there's an accepted convention or not, though.

 

[nutball]

Some astronomers swear by centimeters

Indeed. And 'ergs'. CGS 4tw!!!